How can we use more than 2 cameras in one scene ? (Just like this)
I found a video doing what you wish on Youtube : https://www.youtube.com/watch?v=3vrP7H1PpTI

The video is quite old (2014) so the UI has changed but the process seems still  valid. In short, you can create copies of the scene linked to the same objects and then use compositing node to assemble all the renders into one.

There is also a Blender add-on facilitating multi-camera rendering named Render Burst. Here is the Github repository  and Presentation video. It seems more adapted to picture rendering though.